feat(invoice): add send route

pkg/invoice/report/markdown.go

@@ -0,0 +1,49 @@
+package report
+
+import (
+	"fmt"
+	"html/template"
+	"regexp"
+	"strings"
+
+	"github.com/gomarkdown/markdown"
+	"github.com/gomarkdown/markdown/html"
+	"github.com/gomarkdown/markdown/parser"
+)
+
+func mdToHTML(md string) template.HTML {
+	md = markdownCheckboxesToHTML(md)
+
+	// create markdown parser with extensions
+	extensions := parser.CommonExtensions | parser.AutoHeadingIDs | parser.NoEmptyLineBeforeBlock
+	p := parser.NewWithExtensions(extensions)
+	doc := p.Parse([]byte(md))
+
+	// create HTML renderer with extensions
+	htmlFlags := html.CommonFlags | html.HrefTargetBlank
+	opts := html.RendererOptions{Flags: htmlFlags}
+	renderer := html.NewRenderer(opts)
+
+	return template.HTML(markdown.Render(doc, renderer))
+}
+
+// markdownCheckboxesToHTML keeps a Markdown list but replaces checkboxes with <input>.
+func markdownCheckboxesToHTML(markdown string) string {
+	lines := strings.Split(markdown, "\n")
+	checkboxPattern := regexp.MustCompile(`^(\s*[-*]\s+)\[( |x|X)\][\p{Zs}\s]*(.*)$`)
+
+	for i, line := range lines {
+		if matches := checkboxPattern.FindStringSubmatch(line); matches != nil {
+			prefix := matches[1] // "- " or "* "
+			checked := strings.ToLower(matches[2]) == "x"
+			content := matches[3] // task text
+			if checked {
+				lines[i] = fmt.Sprintf(`%s<input type="checkbox" checked disabled> %s`, prefix, content)
+			} else {
+				lines[i] = fmt.Sprintf(`%s<input type="checkbox" disabled> %s`, prefix, content)
+			}
+		}
+	}
+
+	return strings.Join(lines, "\n")
+}